"Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials
Negatively charged carbon nanoparticles (surface-phenylsulfonated) are "wrapped" in a poly(4-vinylpyridine) cationomer and hydrothermally converted into a pH-responsive core-shell nano-composite. With a "thin shell" this nano-material (ca. 20-40 nm diameter) is water-insoluble bu...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2013
|
| _version_ | 1826276706601664512 |
|---|---|
| author | Lawrence, K Nelson, G Foord, J Felipe-Sotelo, M Evans, N Mitchels, J James, T Xia, F Marken, F |
| author_facet | Lawrence, K Nelson, G Foord, J Felipe-Sotelo, M Evans, N Mitchels, J James, T Xia, F Marken, F |
| author_sort | Lawrence, K |
| collection | OXFORD |
| description | Negatively charged carbon nanoparticles (surface-phenylsulfonated) are "wrapped" in a poly(4-vinylpyridine) cationomer and hydrothermally converted into a pH-responsive core-shell nano-composite. With a "thin shell" this nano-material (ca. 20-40 nm diameter) is water-insoluble but readily dispersed into ethanol and deposited onto electrodes. Zeta-potential measurements suggest a point of zero charge (PZC) at ca. pH 4.5 with negative functional groups dominating in the more alkaline range and positive functional groups dominating in the acidic range. XPS data suggest carboxylate and pyridinium-like functional groups. This is further confirmed in voltammetric measurements for adsorbed cations (methylene blue) and adsorbed anions (indigo carmine). The specific capacitance reaches a maximum of 13 F g-1 at the PZC explained here tentatively by a "shell charging" effect within the nanoparticle shell. This journal is © The Royal Society of Chemistry. |
| first_indexed | 2024-03-06T23:17:56Z |
| format | Journal article |
| id | oxford-uuid:67c2f35e-ff8b-489f-bb93-12444419fb1e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:17:56Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:67c2f35e-ff8b-489f-bb93-12444419fb1e2022-03-26T18:40:26Z"Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterialsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:67c2f35e-ff8b-489f-bb93-12444419fb1eEnglishSymplectic Elements at Oxford2013Lawrence, KNelson, GFoord, JFelipe-Sotelo, MEvans, NMitchels, JJames, TXia, FMarken, FNegatively charged carbon nanoparticles (surface-phenylsulfonated) are "wrapped" in a poly(4-vinylpyridine) cationomer and hydrothermally converted into a pH-responsive core-shell nano-composite. With a "thin shell" this nano-material (ca. 20-40 nm diameter) is water-insoluble but readily dispersed into ethanol and deposited onto electrodes. Zeta-potential measurements suggest a point of zero charge (PZC) at ca. pH 4.5 with negative functional groups dominating in the more alkaline range and positive functional groups dominating in the acidic range. XPS data suggest carboxylate and pyridinium-like functional groups. This is further confirmed in voltammetric measurements for adsorbed cations (methylene blue) and adsorbed anions (indigo carmine). The specific capacitance reaches a maximum of 13 F g-1 at the PZC explained here tentatively by a "shell charging" effect within the nanoparticle shell. This journal is © The Royal Society of Chemistry. |
| spellingShingle | Lawrence, K Nelson, G Foord, J Felipe-Sotelo, M Evans, N Mitchels, J James, T Xia, F Marken, F "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title | "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title_full | "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title_fullStr | "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title_full_unstemmed | "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title_short | "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials |
| title_sort | hydrothermal wrapping with poly 4 vinylpyridine introduces functionality ph sensitive core shell carbon nanomaterials |
| work_keys_str_mv | AT lawrencek hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT nelsong hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT foordj hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT felipesotelom hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT evansn hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT mitchelsj hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT jamest hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT xiaf hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials AT markenf hydrothermalwrappingwithpoly4vinylpyridineintroducesfunctionalityphsensitivecoreshellcarbonnanomaterials |